Responsive product list with cart

What are you most proud of, and what would you do differently next time?

I learned how to deal with cookies in JavaScript. I would add more comments next time

What challenges did you encounter, and how did you overcome them?

I had a problem with storing the cookies in a way that would be easily accessible and iterable. In the end decided to stick with a JSON object

What specific areas of your project would you like help with?

I would really appreciate some feedback regarding the clarity of my code and how can I write cleaner and more optimized code as in my opinion thats as clean and optimized as it can get.